Near-infrared photometry of isolated spirals with and without an AGN

Abstract

We present infrared imaging data in the J and K0 bands obtained for 18 active spiral galaxies, together with 11 non active galaxies taken as a control sample. All of them were chosen to satisfy well de ned isolation criteria so that the observed properties are not related to gravitational interaction. For each object we give: the image in the K0 band, the sharp-divided image (obtained by dividing the observed image by a ltered one), the di erence image (obtained by subtracting a model to the observed one), the color J − K0 image, the ellipticity and position angle pro les, the surface brightness pro les in J and K0, their ts by bulge+disk models and the color gradient. We have found that four (one) active (control) galaxies previously classi ed as non-barred turn out to have bars when observed in the near-infrared. One of these four galaxies (UGC 1395) also harbours a secondary bar. For 15 (9 active, 6 control) out of 24 (14 active, 10 control) of the optically classi ed barred galaxies (SB or SX) we nd that a secondary bar (or a disk, a lense or an elongated ring) is present. The work presented here is part of a large program (DEGAS) aimed at nding out whether there are di er-ences between active and non active galaxies in the properties of their central regions that could be connected with the onset of nuclear activity.